31500213 has 8 divisors (see below), whose sum is σ = 42072576. Its totient is φ = 20964000.

The previous prime is 31500197. The next prime is 31500221. The reversal of 31500213 is 31200513.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31500213 - 2⁴ = 31500197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31500192 and 31500201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31500263) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6933 + ... + 10538.

It is an arithmetic number, because the mean of its divisors is an integer number (5259072).

Almost surely, 2^31500213 is an apocalyptic number.

It is an amenable number.

31500213 is a deficient number, since it is larger than the sum of its proper divisors (10572363).

31500213 is a wasteful number, since it uses less digits than its factorization.

31500213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18075.

The product of its (nonzero) digits is 90, while the sum is 15.

The square root of 31500213 is about 5612.5050556770. The cubic root of 31500213 is about 315.8186917249.

Adding to 31500213 its reverse (31200513), we get a palindrome (62700726).

It can be divided in two parts, 31500 and 213, that added together give a palindrome (31713).

The spelling of 31500213 in words is "thirty-one million, five hundred thousand, two hundred thirteen".